Any deal like that, anyway: arguably the Red Sox two best position players, plus two more projected regulars -- that's already way more than Dombro traded for Chris Sale, who had earned 30.1 WAR through age 27. Castillo is good, but through the same age only has 9.1 WAR so far.
Despite numerical values that a website assigns, there are also practicalities that factor into decisions made by humans. It's why I was sure Bloom would insist on at least getting Verdugo back for Betts (when the site and several posters were saying, "No way"). The Reds should shoot high, but they'd be lucky to get, say Bogaerts and Dalbec, with maybe a minor league arm or two that can throw hard.
No GMs are giving up four everyday players for one guy who pitches every five days.